St Lucy is the one most often invoked, in paintings she is often seen holding a dish with her eyes on it, alluding to the manner of her martyrdom.
St Raphael the Archangel is also invoked because he cured Tobit's blindness.

__________________Who is She that comes forth as the morning rising, fair as the moon, bright as the sun, terrible as an army set in battle array?

St Lucy is the patron for those who are blind or suffer from diseases of the eye, because here eyes were plucked out during her martyrdom. Old statues of her often depict her holding her eyeballs, presumably offering her suffering up to the Lord.

__________________Whatever the Lord pleases He does, on heaven and on earth, in the seas and all deeps. Ps. 135